PLEASE HELP: Pictures added to Test Script Steps Disappear

Good morning/afternoon!

I've been creating test steps and adding many pictures to each step.
However, when I've gone back to these test scripts...sometimes just an hour or two later, all I see is a thumbnail (where the image once was):
I've tried adding them by dragging, uploading, and copying them. When I hit save on the test script they are there, but without rhyme or reason, I go back, and all I see is this.

Thank you in advance!